On Sat, Dec 03, 2016 at 12:58:54PM -0000, John Johansen wrote: > How reliable/repeatable is this for you? > > I have been hammering a machine for multiple days and not been able to > trip this once. > > I have been using the 4.8 ubuntu kernel the ubuntu-lxc/daily and the > ubuntu-lxc/stable ppas. Any more info you can provide?
I could reproduce it quite reliably. The trick is to have concurrent restarts just in the loop I showed. I'll try to verify again in the next few days. Did you observe any hanging lxc restart commands or multiple hanging LXD processes? -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apparmor in Ubuntu. https://bugs.launchpad.net/bugs/1645037 Title: apparmor_parser hangs indefinitely when called by multiple threads Status in apparmor package in Ubuntu: Triaged Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Status in linux source package in Yakkety: In Progress Status in linux source package in Zesty: In Progress Bug description: This bug surfaced when starting ~50 LXC container with LXD in parallel multiple times: # Create the containers for c in c foo{1..50}; do lxc launch images:ubuntu/xenial $c; done # Exectute this loop multiple times until you observe errors. for c in c foo{1..50}; do lxc restart $c & done After this you can ps aux | grep apparmor and you should see output similar to: root 19774 0.0 0.0 12524 1116 pts/1 S+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo30 root 19775 0.0 0.0 12524 1208 pts/1 S+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo26 root 19776 0.0 0.0 13592 3224 pts/1 D+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo30 root 19778 0.0 0.0 13592 3384 pts/1 D+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo26 root 19780 0.0 0.0 12524 1208 pts/1 S+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo43 root 19782 0.0 0.0 12524 1208 pts/1 S+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo34 root 19783 0.0 0.0 13592 3388 pts/1 D+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo43 root 19784 0.0 0.0 13592 3252 pts/1 D+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo34 root 19794 0.0 0.0 12524 1208 pts/1 S+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo25 root 19795 0.0 0.0 13592 3256 pts/1 D+ 20:14 0:00 apparmor_parser -RWL /var/lib/lxd/security/apparmor/cache /var/lib/lxd/security/apparmor/profiles/lxd-foo25 apparmor_parser remains stuck even after all LXC/LXD commands have exited. dmesg output yields lines like: [41902.815174] audit: type=1400 audit(1480191089.678:43): apparmor="STATUS" operation="profile_load" profile="unconfined" name ="lxd-foo30_</var/lib/lxd>" pid=12545 comm="apparmor_parser" and cat /proc/12545/stack shows: [<ffffffff8c9b9378>] aa_remove_profiles+0x88/0x270 21:19 brauner [<ffffffff8c9ac3e4>] profile_remove+0x144/0x2e0 21:19 brauner [<ffffffff8c8319b8>] __vfs_write+0x18/0x40 21:19 brauner [<ffffffff8c832108>] vfs_write+0xb8/0x1b0 21:19 brauner [<ffffffff8c833565>] SyS_write+0x55/0xc0 21:19 brauner [<ffffffff8ce952f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8 21:19 brauner [<ffffffffffffffff>] 0xffffffffffffffff This looks like a potential kernel bug. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/1645037/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
